Dental sealants can help provide additional protection against cavities on the chewing surfaces of teeth. The plastic coating is painted on the grooved chewing surfaces of the back teeth.是什么意思_Dental sealants can help provide additional protection against cavities on the chewing surfaces of teeth. The plastic coating is painted on the grooved chewing surfaces of the back teeth.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句